Mitsubishi A2CCPU User Manual

2. SYSTEM CONffiURATION /MELSEC-A
b) Measures againt momentary power failure for the 1/0
module
Momentary power faiture of the power supply of the
I/O
module may cause incorrect input.
1) Cause for incorrect input due to momentary power
failure
The VO module hardware converts the I/O module
power supply
(24 VDC) to 5 VDC inside the module.
If momentary power failure occurs in the
1/0 module,
incorrect input occurs if
I10 refresh is executed within
duration (A) shown below because: (Time from occurr-
ence of external power supply
OFF to turning OFF of
internal 5VDC)
> (ON to OFF response time of input
module).
External supply 24 VDC (for WO
module power supply and input
external power supply)
Inside
5 VDC
ON
OFF
Input (Xn)
I 1 OFF
1 I
L-4
When the input external power supply is turned
off, input (Xn) turns off after the ON-OFF
response'time of the input module.
2) Prevention of incorrect input
Connect the A2C, A66PC, stabilized power supply and
AC input to one same power supply.
I I
I I
Input module
WO modute
+
,
Stabilized
power supply
l..-_______l. 24 VDC power supply
A66PC
L
--
4--
-
1 Input external
power supply
A2CCPU Twisted pair
cable
Input module
i
I I -\ rl I I
Fig. 2.3 Pow Supply Wiring Exmk
2-5
IB (NAI 66238-A

Mitsubishi A2CCPU Specifications

General

Brand	Mitsubishi
Model	A2CCPU
Category	Controller
Language	English